Andre Jurieu wrote: If it's just a repressed memory, it makes less sense, since we don't know which character is remembering (I guess it could be Georges remembering a day he picked up his son from school).
Now this is an interesting possibility, and the following is pure speculation. A nearly identical shot occurred earlier in the film when Georges picked up Pierrot, and the was one of the first shots in the film where the framing and presentation evoked the idea of surveillance (although there was no subsequent indication that the scene was actually taped).
The idea that this shot might be Georges' memory (as we assume similar 'surveillance framed' flashbacks to his childhood to be) raised (at least) two possibilities:
1) Georges remembers the earlier scene and now realises the presence of Majid's son. Anybody who is going to see the film for a second time could verify this by scanning the frame of that earlier scene for any sign of Majid's son. Frankly, I think it's unlikely.
2) Georges is recalling the earlier scene and suturing in the horrific revelation that his paranoia is suggesting. An interesting possibility that combines the new 'ways of seeing' that he, like us, has been trained to employ with the film's themes of betrayal, conspiracy, familial breakdown and interrogation of (unreliable) memory.